I'm in central burnaby south of brentwood mall. I think our water throughout most of the lower mainland is fairly equal regardless of how far we are from the watersheds.
I usually get between 5 and 10 in, and 0 out after just an RO membrane - no DI required here. Same membrane for 2 years now. I flush it well before each use until the output is 0 before filling my drum.

I'm in Cloverdale, my tap is 14, usually 0-1 after membrane but I use DI anyway. Waste water is 22 and I use it for my cichlid tank.